activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#CC864E"
    android:backgroundTint="#CC864E"
    android:orientation="vertical"
    tools:context=".MainActivity">



    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:backgroundTint="#FFFFFF">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary"
            android:backgroundTint="#CC864E"
            android:minHeight="?attr/actionBarSize"
            android:theme="?attr/actionBarTheme"
            android:title="Welcome">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal">

                <ImageButton
                    android:id="@+id/buttonFields"
                    android:layout_width="85dp"
                    android:layout_height="wrap_content"
                    android:backgroundTint="#FFFFFF"
                    app:srcCompat="@drawable/ball" />

                <ImageButton
                    android:id="@+id/buttonList"
                    android:layout_width="85dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:backgroundTint="#FFFFFF"
                    app:srcCompat="@drawable/customer" />

                <ImageButton
                    android:id="@+id/buttonCoach"
                    android:layout_width="85dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:backgroundTint="#FFFFFF"
                    app:srcCompat="@drawable/coach" />

                <ImageButton
                    android:id="@+id/buttonUser"
                    android:layout_width="85dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:backgroundTint="#FFFFFF"
                    app:srcCompat="@drawable/user" />


            </LinearLayout>
        </androidx.appcompat.widget.Toolbar>

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragmentContainerView"
        android:name="com.example.padel.MainFragment"
        android:layout_width="match_parent"
        android:layout_height="700dp" />


</RelativeLayout>